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diff --git a/components/app_modal/native_app_modal_dialog.h b/components/app_modal/native_app_modal_dialog.h
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+++ b/components/app_modal/native_app_modal_dialog.h
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+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_APP_MODAL_NATIVE_APP_MODAL_DIALOG_H_
+#define COMPONENTS_APP_MODAL_NATIVE_APP_MODAL_DIALOG_H_
+
+#include "ui/gfx/native_widget_types.h"
+
+class JavaScriptAppModalDialog;
+
+class NativeAppModalDialog {
+ public:
+  // Returns the buttons to be shown. See ui::DialogButton for which buttons can
+  // be returned.
+  virtual int GetAppModalDialogButtons() const = 0;
+
+  // Shows the dialog.
+  virtual void ShowAppModalDialog() = 0;
+
+  // Activates the dialog.
+  virtual void ActivateAppModalDialog() = 0;
+
+  // Closes the dialog.
+  virtual void CloseAppModalDialog() = 0;
+
+  // Accepts or cancels the dialog.
+  virtual void AcceptAppModalDialog() = 0;
+  virtual void CancelAppModalDialog() = 0;
+};
+
+#endif  // COMPONENTS_APP_MODAL_NATIVE_APP_MODAL_DIALOG_H_